docs: def register(self, name, asymmetric=False):
          """Decorator for registering a measure with PyPhi.
  
          Args:
              name (string): The name of the measure.
  
          Keyword Args:
              asymmetric (boolean): ``True`` if the measure is asymmetric.
          """
          def register_func(func):
              if asymmetric:
                  self._asymmetric.append(name)
              self.store[name] = func
              return func
          return register_func